pulver



2 Sheets-Sheet 1.

(Nq Model.)

A. J. PULVER.

FURNAGE.

Patented Apr. 5, 1898.

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(No Model.) 2 Sheets-Sheet 2.

A. J. PULVER PURNAGE.

No. 601,983. Patented Apr. 5, 1898.

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NITED STATES l VPATEiwr rrlcn.

ANDREW JACKSON PULVER, OF MILAN, OHIO, ASSIGNOR OF ONE-HALF TO HOMER WV.FISK,

FURNACE.

SPECIFICATION forming part of Letters Patent No. 601,983, dated April5,' 1898.

Application inea May 13, 1897.

To all whom t may concern,.-

Be it known that I, ANDREW JACKSON PUL- vER, a citizen ofthe UnitedStates, residing at Milan, in the county of Erie and State of Ohio, haveinvented a new and useful Furnace,of which the following is aspecification.

This invention has for its obj ect to promote the combustion of gasesliberated from fuel when burning and to prevent the too rapid ,burnin gout of the furnacegrate,the latter being constructed so as to providepassages'for air, which is forced therethrough under pres- -sure andwhich is heated in its travel and permitted to escape in a series ofjets at a high temperature, so as to combine with the gases and consumethem, whereby the heat is intensitied and the fuel consumedeconomically.

p For a full understanding of the merits and advantages of the inventionreference is to be had to the accompanying drawings and the followingdescription.

The improvement is susceptible of various changes in theform,proportion, and the minor details of construction without departingfrom the principle or sacrificing any of the advantages thereof, and toa full disclosure of. the invention an adaptation thereof is shown inthe accompanying drawings, in which- Figure lis a longitudinal sectionof a boilerfurnace constructed in accordance with and embodying theprinciples of this invention. Fig. 2 is a transverse section onthe lineX X of Fig. 1, looking to the front. Fig. 3 is a section on the line Y Yof Fig. 1. Fig. 4 isa plan section of the complete grate on the line ced of Fig. 3. Fig. 5 is a detail view in perv spective of the improvedgrate, having parts broken away and some of the elements separated, soas to show more clearly the detailed construction. Fig. 6 is a detailview of a portion of a side bar, showing more clearly the obliquedisposition of the notches which form the discharge-outlets for theheated air. Corresponding and like parts are referred to in thefollowing description and indicated in the several views of theaccompanying drawings by the same reference characters.

rlhe grate comprises similar side bars 1 and an intermediate bar 2,which are hollow to provide a passage for the circulation of the airwhen the furnace is in operation. The side bars 1 'have inner extensions3 at their ends Serial No. 636,380. (No model.)

in a lower plane than the top side of the said bars 1 and which'arehollow and forma continuation of the space or passage formed in the bodyof the bars. The space or passage formed in the bars 1 extends throughthe top side thereof and is closed by a cap-plate 4, which is secured inplace in any convenient way, so as to be readily removable for anypurpose desired.

Webs 5 connect the inner and outer walls of the bars l and are locatedat intervals in the length thereof and are formed therewith and serve toprevent warping of the bars. The top edge of the inner wall is providedwith notches 6, located between the webs 5 and approaching the plane ofthe cap 4 from a middle point, -said notches being shallow and incliningrearwardly, so as to deliver theheated air in jets of sufficient extentto readily commingle with the gases and smoke and consume them. Therearward inclination of the notches 6 causes the jets to incline towardthe rear of the combustion-chamber and assist materially in promotingthe draft, whereby a greater amount' of air is supplied to the fire' andthe latter caused to burn more freely and withv less Waste.

T he notches 6 are closed at their upper side by the cap 4 andconstitute outlets for the heated air and, being shallow and of acomparatively great length, deliver the air in a thin sheet, whichinsures its combining with the products of combustion, so as to promotethe consumption thereof.

The intermediate bar 2 (one being shown, although it will be understoodthat any desired number may be provided, according to the extent of thegrate) is formed at its ends with cross-heads 7, corresponding with theinner extensions 3 of the side bars 1, said cross-heads and extensionsalinin g and being in a lower plane than the top side of the bars 1. Thecross-heads '7, like the extensions 3, are hollow, and the openingtherein matches the openings in the parts 3, whereby a continuouspassage is had. Lugs 8 project from the opposite sides of the bar 2 toprovide the bed necessary for a proper support of the fuel, so as toprevent wasting thereof. The airpipe 9 connects with the inner or rearcrosshead 7 at an intermediate point, whereby the incoming air isdivided and caused to pass laterally through the side passages 10 andthrough the central passage 11 into the space 12 of the side bars 1 andthence into the iirebox through the outlets 6.

Rocking bars 13, having lugs at their sides corresponding with the lugs8 and entering the spaces formed between them, are journaled at theirends in bearings provided on the inner side of the end bars formed bythe cross-heads 7 and inner extensions 3 when united. These bearings areformed by quadrant-shaped lugs 14, provided at the extremities of theparts 3 and 7 and on their inner side, said lugs matching and unitedlyforming semicircular seats in which the extremities of the rocking bars13 are journaled. This disposition of the bearings brings the rockingbars in line with the joints formed between the side and intermediatebars and divides the strain and weight equally on each, whereby theparts are held in alinement and prevented from slipping. When assemblingthe intermediate-and side bars, the ends of the parts 3 and 7 are causedto abut and are faced true, so as to provide a tight joint, and theadvantage of disposing the rocking bars 13 and their bearings in themanner set forth is apparent, inasmuch as it prevents the parts 3 and 7from moving vertically when the rocking bars are in place. The severalbars 1 and 2 are held together by tie-rods 15, passing through thespaces 10, formed in the parts 3 and 7, said tie rods having nuts attheir threaded ends, by means of which the bars connected thereby aredrawn together. Fixed bars 16, having lugs 17, are supported at theirends by the extensions 3 of the side bars 1 and are placed against thelatter with their lugs facing inward and entering the spaces betweenvthe lugs of the adjacent rocking bars, so as to prevent the formation ofspaces sufiiciently large for the escape of fuel before being thoroughlyconsumed.

A furnace-grate constructed in the manner set forth may be fitted in thefire-box of a furnace in any way found most advantageous, according tothe style of the furnace and the characterof boiler to be heated, and,as shown, it is set in a frame 18, which is built in by brickwork ormasonry, and a part of the masonry extends over the cap-plates 4, thegrate and its supporting-frame being located in advance of thebridge-wall 19 and between it and the front wall of the furnace. Theairpipe 9 connects with an air-pump, blower, or reservoir of compressedair in any desired manner, whereby the air is supplied to the grateunder pressure, and this air-pipe connects with a heating-coil 2O in therear of the boiler, whereby the incoming air is heated prior to itsadmission into the grate, so as to insure its being supplied to thecombustionchamber of the fire-box at such temperature as to cause it tocombine with the products of combustion. and prevent the wasting thereofand insure their utilization for heating the water in the boiler. A

Having thus described the invention, what is claimed as new is 1. In afurnace, the combination of intermediate and side bars having endextensions which abut and unitedly form end bars, lugs formed on theinner side of the end extensions of the bars at their extremities andunitedly forming bearings opposite the joints formed between the saidextensions, and grate-bars supported at their ends in the said bearingsand overlapping the joints formed between the end extensions of theaforesaid bars, substantially as and for the purpose set forth.

2. In a furnace, the combination of an intermediate and side bars, thelatter having inner extensions and the former cross-heads at their endswhich are connected together, quadrant-shaped lugs formed on the innerside of the cross-heads and inner extensions at their extremities andunitedly providing bearings, and rocking bars journaled at their ends inthe said bearings and overlapping the joints formed between thecross-heads and inner extensions, substantially as set forth for thepurpose described.

3. In a furnace, the combination of an intermediate and side bars madehollow and having hollow end extensions which are connected together andhave the spaces formed therein in communication, the side bars havingtheir spaces extending through the top side and having notches in thetop edge of the inner walls, and cap-plates closingthe u pper side ofthe spaces and notchesin the side bars, substantially as shown for thepurpose set forth.

4. In a furnace, a hollow bar having its top side open, and having thesidewalls connected at intervals by transverse webs, and having notchesin the top edge of a side wall, said notches being deeper at their innerends and contracting toward their extremities and outer discharge endsand inclining rearwardly, and a cap-plate closing the top side of thebar and the said notches, substantially as described.

5. A furnace comprising hollow intermediate and side bars, the latterhaving inner hollow extensions and the former hollow crosshcads,tie-rods connecting the several bars and extending through the spacesformed within the end extensions thereof, cap-plates closing the spacesof the side bars and notches formed in the top edge of the inner wallsthereof, and rocking bars journaled in bearings provided opposite thejoints formed between the inner extensions and cross-heads,substantially as shown and described.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

ANDREW JACKSON PULVER.

Vitnesses:

F. C. SMITH, G. B. SMITH.

IOO

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